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There are alternatives out there, but it will really depend on what features you use on each of the applications.
For Photoshop:
The Gimp http://www.gimp.org/
Paint.NET http://www.getpaint.net/
CinePaint http://www.cinepaint.org/ For Illustrator:
Inkscape http://inkscape.org/
CorelDraw http://www.corel.com/corel/pages/index.jsp?pgid=5300054&... For InDesign
Scribus http://www.osalt.com/scribus